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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2014
Common Stock and Treasury Stock Activity | The Company has 750 million authorized shares of common stock, par value $0.01 per share. The number of shares of common stock and treasury stock and the share activity for 2014 and 2013 were as follows:
|  | Common Shares |  |  | Treasury Shares |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Balance at the beginning of the year |  |  | 166,667,936 |  |  |  | 163,855,647 |  |  |  | 2,404,320 |  |  |  | 700,102 |
Stock plan shares issued |  |  | 2,877,761 |  |  |  | 4,516,507 |  |  |  | — |  |  |  | — |
Shares surrendered by optionees |  |  | (288,797 | ) |  |  | (296,100 | ) |  |  | 288,797 |  |  |  | 296,100 |
Common stock repurchases |  |  | (11,116,772 | ) |  |  | (1,408,118 | ) |  |  | 11,116,772 |  |  |  | 1,408,118 |
Balance at the end of the year |  |  | 158,140,128 |  |  |  | 166,667,936 |  |  |  | 13,809,889 |  |  |  | 2,404,320 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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